* {
    margin: 0;
    padding: 0;
  }
  
  ul, ol, li {
    list-style: none;
  }
  
  img {
    width: 100%;
    height: 100%;
    display: block;
  }
  
  .box {
    width: 450px;
    height: 600px;
    border: 1px solid #333;
    margin: 50px;
    display: flex;
    flex-direction: column;
    position: relative;
  }
  
  .box > .show {
    height: 450px;
    border-bottom: 1px solid #333;
    position: relative;
  }
  
  .box > .show > .mask {
    width: 200px;
    height: 200px;
    position: absolute;
    left: 100px;
    top: 100px;
    opacity: 0.5;
    background-color: yellow;
  
    pointer-events: none;
  
    display: none;
  }
  
  .box > .list {
    flex: 1;
    display: flex;
    align-items: center;
  }
  
  .box > .list > li {
    width: 54px;
    height: 54px;
    border: 1px solid #333;
    margin-left: 30px;
    cursor: pointer;
  }
  
  .box > .list > li > img {
    pointer-events: none;
  }
  
  .box > .list > li.active {
    border-color: orange;
  }
  
  .box > .enlarge {
    width: 400px;
    height: 400px;
    position: absolute;
    top: 0;
    left: 110%;
    overflow: hidden;
  
    display: none;
  }
  
  .box > .enlarge > img {
    width: 800px;
    height: 800px;
    position: absolute;
    left: 0;
    top: 0;
  }
  